<template>
    <div>
        <!--        面包屑导航区-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

<!--        卡片视图区域-->
        <el-card>

<!--            提示区域-->
            <el-alert
                    title="添加商品信息"
                    type="info"
                    center
                    show-icon
                    :closable="false">
            </el-alert>

<!--            步骤条-->
            <el-steps :space="200" :active="activeIndex - 0 " finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
<!--                Tab栏区域-->
                <el-tabs :tab-position="'left'"v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                    v-model="addForm.goods_cat"
                                    :options="cateList"
                                    :props="cateProps"
                                    @change="handleChange"
                                    clearable>
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="(item,index) in manyTableData" :key="index">
<!--                             复选框组-->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>

                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="(item,index) in onlyTableData" :key="index">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--                                action表示图片要上传到的后台API地址-->
                        <el-upload
                                :headers="headerObj"
                                :action="uploadURL"
                                :on-preview="handlePreview"
                                :on-remove="handleRemove"
                                :on-success="handleSuccess"
                                list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
<!--                        富文本编辑器组件-->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>

<!--                        添加商品的按钮-->
                        <el-button type="primary" class="btnAdd" @click="add"> 添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>

        </el-card>



<!--         图片预览-->
        <el-dialog
                title="图片预览"
                :visible.sync="previewVisible"
                width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
     // 导入深拷贝包
    import _ from 'lodash'


    export default  {
        data() {
            return {
                activeIndex: '0',
                // 添加商品的表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片数组
                    pics: [],
                    attrs: []
                },
                addFormRules: {
                    goods_name : [
                        { required: true ,message : '请输入商品名称' , trigger :'blur' }
                    ],
                    goods_price : [
                        { required: true ,message : '请输入商品价格' , trigger :'blur' }
                    ],
                    goods_weight : [
                        { required: true ,message : '请输入商品重量' , trigger :'blur' }
                    ],
                    goods_number : [
                        { required: true ,message : '请输入商品数量' , trigger :'blur' }
                    ],
                    goods_cat : [
                        { required: true , message : '请选择商品分类' , trigger : 'blur'}
                    ]
                },
                // 商品分类数据
                cateList:[],
                // 级联选择器的配置对象
                cateProps : {
                    expandTrigger: 'hover',
                    label: 'cat_name',
                    value: 'cat_id',
                    children : 'children'
                },
                // 动态参数列表数据
                manyTableData: [],
                // 静态参数列表数据
                onlyTableData: [],
                // 上传图片的URL地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 上传图片文件的请求头携带token
                headerObj: {
                    Authorization : window.sessionStorage.getItem("token")
                },
                // 预览图片的URL
                previewPath : '',
                // 控制图片预览的现实与隐藏
                previewVisible: false,
                // 商品的详情描述
                goods_introduce: ''
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有商品分类数据
            async getCateList() {
                const {data : res} = await this.$http.get(`categories`)
                if(res.meta.status !== 200 ) return this.$message.error("获取商品分类列表失败")
                this.cateList = res.data
            },
            // 级联选择器选中项变化,会触发这个函数
            handleChange() {
                if(this.addForm.goods_cat.length != 3) {
                    this.addForm.goods_cat = []
                }
            },
            // 切换Tab时校验
            beforeTabLeave(activeName , oldActiveName) {
                if( oldActiveName == '0' && this.addForm.goods_cat.length != 3) {
                    this.$message.error("请先选择分类！")
                    return false
                }
            },
            // Tab 被点击的事件
            async tabClicked() {
                // 点击的是商品参数
                if(this.activeIndex == 1) {
                    const {data : res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                        params: { sel : 'many'}
                    })
                    if(res.meta.status !== 200 ) return this.$message.error("获取动态参数列表失败")

                    res.data.forEach( item=> {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
                    })
                    this.manyTableData = res.data
                }
                // 点击的是商品属性
                if(this.activeIndex == 2) {
                    const {data : res } = await this.$http.get(`categories/${this.cateId}/attributes`,{
                        params: { sel : 'only'}
                    })
                    if(res.meta.status !== 200 ) return  this.$message.error("获取静态属性列表失败")

                    this.onlyTableData = res.data
                }
            },
            // 处理图片预览效果
            handlePreview(file) {
                this.previewPath = file.response.data.url
                this.previewVisible = true
            },
            // 处理移除图片的操作
            // file为将要被移除的文件对象
            handleRemove(file) {
                // 1.获取将要删除的图片的临时路径
                const filePath = file.response.data.tmp_path
                // 2.从pics数组中，找到这个图片对应的索引值
                const index = this.addForm.pics.findIndex( x =>
                    x.pic === filePath
                )
                // 3.调用数组的splice 方法，把图片信息对象，从pics数组中移除
                this.addForm.pics.splice(index,1)
            },
            // 监听图片上传成功的事件
            handleSuccess(response) {
                // 拼接得到一个图片信息对象
                const picInfo = { pic: response.data.tmp_path}
                // 将图片信息兑奖，push到pics数组中
                this.addForm.pics.push(picInfo)
            },
            // 添加商品
            add() {
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid) {
                        return this.$message.error("请填写必要的表单项")
                    }

                    // 深拷贝对象
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')

                    //处理动态参数和静态属性
                    this.manyTableData.forEach( item => {
                        const newInfo = {
                            attr_id : item.attr_id,
                            attr_value : item.attr_vals.join(',')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    this.onlyTableData.forEach( item => {
                        const newInfo = {
                            attr_id : item.attr_id,
                            attr_value : item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs


                    // 发起请求添加商品
                    const {data : res } = await this.$http.post(`goods`,form)
                    if(res.meta.status !== 201) {
                        return this.$message.error("添加商品失败!")
                    }

                    this.$message.success("添加商品成功!")
                    this.$router.push('/goods')
                })
            }
        },
        computed: {
            cateId() {
                if(this.addForm.goods_cat.length != 3 ) {
                    return null
                }else {
                    return this.addForm.goods_cat[2]
                }
            }
        }
    }
</script>

<style lang="less" scoped>
.el-steps {
    margin: 20px 0;
}
    .el-checkbox {
        margin-right: 10px;
    }
    .previewImg {
        width: 100%;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>
